The only tangible difference between the X-E2 and the X-T10 is the location of the EVF, tilting screen and some controls. They use the exact same sensor, EVF, AF system and firmware.
The X-Pro2 is the "best" body from Fuji, but it's a good bit more expensive. The X-T1 is essentially the same as the X-T10 but with a larger body and much nicer EVF, weather sealing and a few other enhancements and no built in flash.
If you don't mind buying used there is in my opinion absolutely no reason to buy the X-E2s, it's nearly identical to the X-E2 with the latest firmware.
Good summary, thanks for sharing.
Uh-oh, now I gotta look at Fuji again! 



